I think what you have wrote sounds great but think that first paragraph without further explaination of where you are coming from.. could be taken as Justy said as being condescending by some doctors. Maybe if the whole thing was changed a little to explain where you are coming from more, it wouldnt sound as condescending??
To say the same but be less condescending.. I suggest to take the words "you" out.... change . to "doctors" so it appears more as a generalised statement. You want the doctor to be mentally thinking "yes, yes" at what you are saying (being happy with that first paragraph) ... you want to get the doctor on side in a way.. to be open to you and respond well to the rest of your letter..
eg
If a new patient comes in with diabetes, doctors have an understanding of what that means, and are familiar with the treatment approaches. Doctors also know the myriad ways that patient’s body is likely to differ from that of a healthy person. This knowledge affects treatment of any medical problem that patient has.
....
I too find it far easier to do a letter to doctors about what type of relationship I want with my doctor and my expectations as far as ME/CFS goes. Talking face to face talking is far harder and doctors have sometimes told me along the lines of "yes I can help.". just due to the expectation that they are to help patients.. and not saying it with much real thought.
Many doctors after telling me they are fine with treating someone with ME/CFS, have later dropped me as a patient (or told me they no longer wanted me seeing them) as soon as they did realise what they were getting themselves into.. I even had one do that to me after 2-3 years
(that one had lead me on making me believe he believed in an illness he really didnt.. he thought psychs could fix me but had made sure to keep his ideas from me.
When I started having to be refered to specialists who actually then were finding uncommon abbnormalities on recognised tests he then no longer wanted me as a patient.
His words "Your case is far too complex for me, I'd prefer if you found someone else" (and something about how he doesnt like seeing me).
The year before he actually come out and said this.. he was cancelling out a lot of my appointments, making me feel like a second rate patient cause he cancelled so many that had been made.. always with the excuse some emergency situation came up (so I kept on believing that and telling myself I was being silly thinking he may be treating me differently to his other patients). I now realise he was just trying to get rid of me. So many times I was very sick and needed to see him for something but had my appointment (sometimes one I'd had to wait a week or more) cancelled for various excuses from him. He even cancelled at least one of my appointments as there was a student doctor there observing things that day.
Others have dumped me as a patient as soon as they made severe mistakes due to their lack of ME knowledge eg doctor who called an ambulance as he couldnt believe the symptoms he was seeing when I crashed were ME/CFS. After that incident cause hospital discharged me the next day saying my symptoms were just ME/CFS.. he put on my notes he longer wanted to see me.. I think my condition scared him.
Ive had several incidents where doctors have dumped me just due to this condition rather then it being a case of me dumping them.. Irronically one of the doctors who dumped me had accussed me of "doctor shopping" before he took me on.. so I basically pledged I'd stick with him which I did for several years (if i didnt promise that, he wasnt going to take me on) ..but then in the end he dumps me due to "condition too complex for me".
When you send a letter to try to find out if they are going to be suitable for you.. you are drawing special attention to yourself that you have special needs .. making yourself more stand out to that doctor and hence making him pay a bit more thought to it all and his thoughts on ME/CFS and what he'd really be willing to do for you.
There is nothing worst when one puts so much energy into trying to form a good patient/doctor relationship (its hard hard work, finding all the stuff one needs to take in), only to end up having them dump you due to the condition they'd previously believed they could help you with and one they thought would be far easier.